// Copyright (C) 2010, 2011, 2012 GlavSoft LLC.
// All rights reserved.
//
//-------------------------------------------------------------------------
// This file is part of the TightVNC software.  Please visit our Web site:
//
//                       http://www.tightvnc.com/
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//-------------------------------------------------------------------------
//
package com.glavsoft.rfb.protocol;

import com.glavsoft.drawing.Renderer;
import com.glavsoft.exceptions.CommonException;
import com.glavsoft.exceptions.ProtocolException;
import com.glavsoft.exceptions.TransportException;
import com.glavsoft.rfb.ClipboardController;
import com.glavsoft.rfb.IRepaintController;
import com.glavsoft.rfb.client.FramebufferUpdateRequestMessage;
import com.glavsoft.rfb.client.SetPixelFormatMessage;
import com.glavsoft.rfb.encoding.EncodingType;
import com.glavsoft.rfb.encoding.PixelFormat;
import com.glavsoft.rfb.encoding.decoder.Decoder;
import com.glavsoft.rfb.encoding.decoder.DecodersContainer;
import com.glavsoft.rfb.encoding.decoder.FramebufferUpdateRectangle;
import com.glavsoft.rfb.encoding.decoder.RichCursorDecoder;
import com.glavsoft.transport.Reader;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.logging.Logger;

public class ReceiverTask implements Runnable {

    private static final byte FRAMEBUFFER_UPDATE = 0;
    private static final byte SET_COLOR_MAP_ENTRIES = 1;
    private static final byte BELL = 2;
    private static final byte SERVER_CUT_TEXT = 3;
    private static Logger logger = Logger.getLogger("com.glavsoft.rfb.protocol.ReceiverTask");
    private final Reader reader;
    private volatile boolean isRunning = false;
    private Renderer renderer;
    private final IRepaintController repaintController;
    private final ClipboardController clipboardController;
    private final DecodersContainer decoders;
    private FramebufferUpdateRequestMessage fullscreenFbUpdateIncrementalRequest;
    private final ProtocolContext context;
    private PixelFormat pixelFormat;
    private boolean needSendPixelFormat;

    public ReceiverTask(Reader reader,
            IRepaintController repaintController, ClipboardController clipboardController,
            DecodersContainer decoders, ProtocolContext context) {
        this.reader = reader;
        this.repaintController = repaintController;
        this.clipboardController = clipboardController;
        this.context = context;
        this.decoders = decoders;
        renderer = repaintController.createRenderer(reader, context.getFbWidth(), context.getFbHeight(),
                context.getPixelFormat());
        fullscreenFbUpdateIncrementalRequest =
                new FramebufferUpdateRequestMessage(0, 0, context.getFbWidth(), context.getFbHeight(), true);
    }

    @Override
    public void run() {
        isRunning = true;
        while (isRunning) {
            try {
                byte messageId = reader.readByte();
                switch (messageId) {
                    case FRAMEBUFFER_UPDATE:
//					logger.fine("Server message: FramebufferUpdate (0)");
                        framebufferUpdateMessage();
                        break;
                    case SET_COLOR_MAP_ENTRIES:
                        logger.severe("Server message SetColorMapEntries is not implemented. Skip.");
                        setColorMapEntries();
                        break;
                    case BELL:
                        logger.fine("Server message: Bell");
                        System.out.print("\0007");
                        System.out.flush();
                        break;
                    case SERVER_CUT_TEXT:
                        logger.fine("Server message: CutText (3)");
                        serverCutText();
                        break;
                    default:
                        logger.severe("Unsupported server message. Id = " + messageId);
                }
            } catch (TransportException e) {
                logger.severe("Close session: " + e.getMessage());
                if (isRunning) {
                    context.cleanUpSession("Connection closed.");
                }
                stopTask();
            } catch (ProtocolException e) {
                logger.severe(e.getMessage());
                if (isRunning) {
                    context.cleanUpSession(e.getMessage() + "\nConnection closed.");
                }
                stopTask();
            } catch (CommonException e) {
                logger.severe(e.getMessage());
                if (isRunning) {
                    context.cleanUpSession("Connection closed.");
                }
                stopTask();
            } catch (Throwable te) {
                StringWriter sw = new StringWriter();
                PrintWriter pw = new PrintWriter(sw);
                te.printStackTrace(pw);
                if (isRunning) {
                    context.cleanUpSession(te.getMessage() + "\n" + sw.toString());
                }
                stopTask();
            }
        }
    }

    private void setColorMapEntries() throws TransportException {
        reader.readByte();  // padding
        reader.readUInt16(); // first color index
        int length = reader.readUInt16();
        while (length-- > 0) {
            reader.readUInt16(); // R
            reader.readUInt16(); // G
            reader.readUInt16(); // B
        }
    }

    private void serverCutText() throws TransportException {
        reader.readByte();  // padding
        reader.readInt16(); // padding
        int length = reader.readInt32() & Integer.MAX_VALUE;
        clipboardController.updateSystemClipboard(reader.readBytes(length));
    }

    public void framebufferUpdateMessage() throws CommonException {
        reader.readByte(); // padding
        int numberOfRectangles = reader.readUInt16();
        while (numberOfRectangles-- > 0) {
            FramebufferUpdateRectangle rect = new FramebufferUpdateRectangle();
            rect.fill(reader);

            Decoder decoder = decoders.getDecoderByType(rect.getEncodingType());
            logger.finest(rect.toString() + (0 == numberOfRectangles ? "\n---" : ""));
            if (decoder != null) {
                decoder.decode(reader, renderer, rect);
                repaintController.repaintBitmap(rect);
            } else if (rect.getEncodingType() == EncodingType.RICH_CURSOR) {
                RichCursorDecoder.getInstance().decode(reader, renderer, rect);
                repaintController.repaintCursor();
            } else if (rect.getEncodingType() == EncodingType.CURSOR_POS) {
                renderer.decodeCursorPosition(rect);
                repaintController.repaintCursor();
            } else if (rect.getEncodingType() == EncodingType.DESKTOP_SIZE) {
                fullscreenFbUpdateIncrementalRequest =
                        new FramebufferUpdateRequestMessage(0, 0, rect.width, rect.height, true);
                synchronized (renderer) {
                    renderer = repaintController.createRenderer(reader, rect.width, rect.height,
                            context.getPixelFormat());
                }
                context.sendMessage(new FramebufferUpdateRequestMessage(0, 0, rect.width, rect.height, false));
//				repaintController.repaintCursor();
            } else {
                throw new CommonException("Unprocessed encoding: " + rect.toString());
            }
        }
        synchronized (this) {
            if (needSendPixelFormat) {
                needSendPixelFormat = false;
                context.setPixelFormat(pixelFormat);
                context.sendMessage(new SetPixelFormatMessage(pixelFormat));
                logger.fine("sent: " + pixelFormat);
                context.sendRefreshMessage();
                logger.fine("sent: nonincremental fb update");
            } else {
                context.sendMessage(fullscreenFbUpdateIncrementalRequest);
            }
        }
    }

    public synchronized void queueUpdatePixelFormat(PixelFormat pf) {
        pixelFormat = pf;
        needSendPixelFormat = true;
//		context.sendMessage(new FramebufferUpdateRequestMessage(0, 0, 1, 1, false));
    }

    public void stopTask() {
        isRunning = false;
    }
}
